"I have carefully examined this cavern," said the captain, after a moment's pause, "and there are only two ways by which those men could possibly get in. You need not be afraid that any one can scramble down the walls of that farthest apartment. That could not be done, though they might be able to fire upon any one in it. But in the middle room you will be perfectly secure from gunshots. I shall keep Maka on guard a little back from the entrance to the pa.s.sage. He will lie on the ground, and can hear footsteps long before they reach us. It is barely possible that some of them might enter by the great cleft in the cave on the other side of the lake, but in that case they would have to swim across, and I shall station that new African on the ledge of which you have heard, and if he sees any of them coming in that direction, I know he will give very quick warning. I hardly think, though, that they would trust themselves to be picked off while swimming."

"And you?" said she.

"Oh, I shall keep my eyes on all points," said he, "as far as I can. I begin to feel a spirit of fight rising up within me. If I thought I could keep them off until Rynders gets here, I almost wish they would then come. I would like to kill a lot of them."

"Suppose," said Edna Markham, after a moment's reflection, "that they should see Mr. Rynders coming back, and should attack him."

"I hardly think they would do that," replied the captain. "He will probably come in a good-sized vessel, and I don't think they are the kind of men for open battle. They are midnight sneaks and a.s.sa.s.sins. Now, I advise all of you to go and get something to eat. It would be better for us not to try to do any cooking, and so make a smoke."

The captain did not wish to talk any more. Miss Markham's last remark had put a new fear into his mind. Suppose the Rackbirds had lured Rynders and his men on sh.o.r.e? Those sailors had but few arms among them. They had not thought, when they left, that there would be any necessity for defence against their fellow-beings.

When Edna Markham told Mrs. Cliff what the captain had said about their chances, and what he intended to do for their protection, the older woman brightened up a good deal.

"I have great faith in the captain," she declared, "and if he thinks it is worth while to make a fight, I believe he will make a good one. If they should be firing, and Mr. Rynders is approaching the coast, even if it should be night, he would lose no time in getting to us."

Toward the close of that afternoon three wild beasts came around the point of the bluff and made their way northward along the beach. They were ferocious creatures with s.h.a.ggy hair and beards. Two of them carried guns, and each of them had a knife in his belt. When they came to a broad bit of beach above the reach of the waves, they were very much surprised at some footsteps they saw. They were the tracks of two men, instead of those of the one they were looking for. This discovery made them very cautious. They were eager to kill the escaped African before he got far enough away to give information of their retreat, for they knew not at what time an armed force in search of them might approach the coast. But they were very wary about running into danger. There was somebody with that black fellow--somebody who wore boots.

After a time they came to the boat. The minute they saw this, each miscreant crouched suddenly upon the sand, and, with c.o.c.ked guns, they listened. Then, hearing nothing, they carefully examined the boat. It was empty--there were not even oars in it.

Looking about them, they saw a hollow behind some rocks. To this they ran, crouching close to the ground, and there they sat and consulted.

It was between two and three o'clock the next morning that Maka's eyes, which had not closed for more than twenty hours, refused to keep open any longer, and with his head on the hard, rocky ground of the pa.s.sage in which he lay, the poor African slept soundly. On the shelf at the edge of the lake, the other African, Mok, sat crouched on his heels, his eyes wide open. Whether he was asleep or not it would have been difficult to determine, but if any one had appeared in the great cleft on the other side of the lake, he would have sprung to his feet with a yell--his fear of the Rackbirds was always awake.

Inside the first apartment was Captain Horn, fast asleep, his two guns by his side. He had kept watch until an hour before, but Ralph had insisted upon taking his turn, and, as the captain knew he could not keep awake always, he allowed the boy to take a short watch. But now Ralph was leaning back against one of the walls, snoring evenly and steadily. In the next room sat Edna Markham, wide awake. She knew of the arrangement made with Ralph, and she knew the boy's healthy, sleepy nature, so that when he went on watch she went on watch.

Outside of the cave were three wild beasts. One of them was crouching on the farther end of the plateau. Another, on the lower ground a little below, stood, gun in hand, and barely visible in the starlight. A third, barefooted, and in garments dingy as the night, and armed only with a knife, crept softly toward the entrance of the cave. There he stopped and listened. He could plainly hear the breathing of the sleepers. He tried to separate these sounds one from another, so that he should be able to determine how many persons were sleeping inside, but this he could not do. Then his cat-like eyes, becoming more and more accustomed to the darkness within the entrance, saw the round head of Maka close upon the ground.

The soul of the listening fiend laughed within him. "Pretty watchers they are," he said to himself. "Not three hours after midnight, and they are all snoring!" Then, as stealthily and as slowly as he had come, he slipped away, and joining the others, they all glided through the darkness down to the beach, and then set off at their best speed back to their rendezvous.

After they had discovered that there were people in the cave, they had not thought of entering. They were not fully armed, and they did not know how many persons were inside. But they knew one thing, and that was that these shipwrecked people--for that was what they must be--kept a very poor watch, and if the whole band came on the following night, the affair would probably be settled with but very little trouble, no matter how large the party in the cave might be. It was not necessary to look any further for the escaped negro. Of course, he had been picked up by these people.

The three beasts reached their camp about daybreak, and everybody was soon awakened and the tale was told.

"It is a comfort," said the leader, lighting the stump of a black pipe which he thrust under his great mustache, and speaking in his native tongue, which some of them understood, and others did not, "to know that to-night's work is all cut out for us. Now we can take it easy to-day, and rest our bones. The order of the day is to keep close. No straggling, nor wandering. Keep those four n.i.g.g.e.rs up in the pigeonhole. We will do our own cooking to-day, for we can't afford to run after any more of them. Lucky the fellow who got away can't speak English, for he can't tell anything about us, any more than if he was an ape. So snooze to-day, if you want to. I will give you work to do for to-night."

CHAPTER VII

GONE!

That morning, when the party in the cavern had had their breakfast, with some hot tea made on a spiritlamp which Mrs. Cliff had brought, and had looked cautiously out at the sunlit landscape, and the sea beyond, without seeing any signs or hearing any sound of wicked men, there came a feeling of relief. There was, indeed, no great ground for such a feeling, but as the Rackbirds had not come the day before nor during the night, perhaps they would not come at all. It might be they did not care whether the black man ran away or not. But Captain Horn did not relax his precautions. He would take no chances, and would keep up a watch day and night.

When, on the night before, the time had come for Ralph's watch to end, his sister had awakened him, and when the captain, in his turn, was aroused, he had not known that it was not the boy who had kept watch during his sleep.

In the course of the morning Mrs. Cliff and Edna, having been filled with an intense desire to see the wonderful subterranean lake, had been helped over the rocky barrier, and had stood at the edge of the water, looking over to where it was lighted by the great chasm in the side of the rocks, and endeavoring to peer into the solemn, cavernous distance into which it extended on the right. Edna said nothing, but stood gazing at the wonderful scene--the dark, mysterious waters before her, the arched cavern above her, and the picture of the bright sky and the tops of the distant mountains, framed by the sides of the great opening which stretched itself upward like a cathedral window on the other side of the lake.

"It frightens me," said Mrs. Cliff. "To be sure, this water was our salvation, for we should have been dead by this time, pirates or no pirates, if we had not found it. But it is terrifying, for all that. We do not know how far it stretches out into the blackness, and we do not know how far down it goes. It may be thousands of feet deep, for all we know. Don't go so near the edge, Ralph. It makes me shudder."

When the little party had returned to the cavern, the captain and the two ladies had a long talk about the lake. They all agreed that the existence of this great reservoir of water was sufficient to account for the greenness and fertility of the little plateau outside. Even if no considerable amount of water trickled through the cracks in the rocks, the moisture which arose from the surface of the water found its way out into the surrounding atmosphere, and had nourished the bushes and vines.

For some time they discussed their new-found water-supply, and they were all glad to have something to think about and talk about besides the great danger which overhung them.

"If it could only have been the lake without the Rackbirds," said Mrs. Cliff.

"Let us consider that that is the state of the case," remarked Edna. "We have the lake, and so far we have not had any Rackbirds."

It was now nearly noon, and the captain looked around for Ralph, but did not see him. He went to search for him, and finding that the boy had not pa.s.sed Maka, who was on watch, he concluded he must have gone to the lake. There was no reason why the restless youth should not seek to enliven his captivity by change of scene, but Captain Horn felt unwilling to have any one in his charge out of sight for any length of time, so he went to look for Ralph.

He found no one on the rocky shelf. As there had been little reason to expect a water attack at this hour, Mok had been relieved from guard for a meal and a nap. But as Ralph was not here, where could he be? A second glance, however, showed the captain the boy's clothes lying close by, against the upright side of the rock, and at that moment he heard a cry.

His eyes flashed out toward the sound. There on the other side of the water, sitting on a bit of projecting rock not far from the great opening in the cave, he saw Ralph. At first the captain stood dumb with amazement, and he was just about to call out, when Ralph shouted again.

"I swam over," he said, "but I can't get back. I've got the cramps.

Can't you make some sort of a raft, and come over to me! The water's awfully cold."

Raft, indeed! There was no material or time for anything of the kind. If the boy dropped off that bit of rock, he would be drowned, and the captain did not hesitate a moment. Throwing aside his jacket and slipping off his shoes, he let himself down into the water and struck out in Ralph's direction. The water was, indeed, very cold, but the captain was a strong swimmer, and it would not take him very long to cross the lake at this point, where its width was not much more than a hundred feet. As he neared the other side he did not make immediately for Ralph. He thought it would be wise to rest a little before attempting to take the boy back, and so he made for another point of rock, a little nearer the opening, urging the boy, as he neared him, to sit firmly and keep up a good heart.

"All right," said Ralph. "I see what you are after. That is a better place than this, and if you land there I think I can scramble over to you."

"Don't move," said the captain. "Sit where you are until I tell you what to do."

The captain had not made more than two or three strokes after speaking when his right hand struck against something hard, just below the surface of the water. He involuntarily grasped it. It was immovable, and it felt like a tree, a few inches in diameter, standing perpendicularly in the lake. Wondering what this could be, he took hold of it with his other hand, and finding that it supported him, he let his feet drop, when, to his surprise, he found that they rested on something with a rounded surface, and the idea instantly came into his mind that it was a submerged tree, the trunk lying horizontally, from which this upright branch projected. This might be as good a resting-place as the rock to which he had been going, and standing on it, with his head well out of the water, he turned to speak to Ralph. At that moment his feet slipped from the slimy object on which he stood, and he fell backward into the water, still grasping, however, his upright support. But this did not remain upright more than an instant, but yielded to his weight, and the end of it which he held went down with him. As he sank, the captain, in his first bewilderment, did not loosen his grasp upon what had been his support, and which still prevented him from sinking rapidly. But in a moment his senses came to him, he let go, and a few downward strokes brought him to the surface of the water. Then he struck out for the point of rock for which he had been aiming, and he was soon mounted upon it.

"Hi!" shouted Ralph, who had been so frightened by the captain's sudden sinking that he nearly fell off his narrow seat, "I thought something had pulled you down."

The captain did not explain. He was spluttering a little after his involuntary dive, and he wanted to get back as soon as possible, and so wasted no breath in words. In a few minutes he felt himself ready for the return trip, and getting into the water, he swam to Ralph. Following the directions given him, the boy let himself down into the water behind the captain, and placed his hands upon the latter's hips, firmly grasping the waistband of his trousers. Then urging the boy not to change his position, nor attempt to take hold of him in any other way, the captain struck out across the lake, Ralph easily floating behind him.

When they stood upon the shelf on the other side, and Ralph, having rubbed himself down with the captain's jacket, put on his clothes, Captain Horn rather sternly inquired of him how he came to do such a foolish and wicked thing as to run the risk of drowning himself in the lake at a time when his sister and his friends had already trouble enough on their minds.

Ralph was sorry, of course, that the captain had to come after him, and get himself wet, but he explained that he wanted to do something for the good of the party, and it had struck him that it would be a very sensible thing to investigate the opening on the other side of the lake. If he could get out of that great gap, he might find some way of climbing out over the top of the rocks and get to the place where his flag was, and then, if he saw Mr. Rynders coming, he could wave it. It would be a great thing if the people in the vessel which they all expected should see that flag the moment they came in sight of the coast. They might get to sh.o.r.e an hour or two sooner than if they had not seen it.

"If the cramp in this leg had kept off five minutes longer," he said, "I would have reached that big hole, and then, if I could have climbed over the top of the rocks, I could have come down on the other side to the front door, and asked Maka to get me my clothes, so I would not have had to swim back at all."

"That will do," said the captain. "And now that you are dressed, you can go inside and get me that woollen shirt and trousers that I use for a pillow, for I must take off these wet things."

When the boy came back with the clothes, the captain told him that he need not say anything to his sister or Mrs. Cliff about the great danger he had been in, but before he had finished his injunction Ralph interrupted him.

"Oh, I have told them that already," said he. "They wanted to know where I had been, and it did not take a minute to tell them what a splendid swimmer you are, and how you came over after me without taking as much as two seconds to think about it. And I let them know, too, that it was a mighty dangerous thing for you to do. If I had been one of those fellows who were not used to the water, and who would grab hold of any one who came to save them, we might both have gone to the bottom together."

The captain smiled grimly. "It is hard to get ahead of a boy," he said to himself.

It was late that afternoon when Captain Horn, with Ralph and the two ladies, were standing on the rocks in the inner apartment, trying to persuade themselves that they were having a cosey cup of tea together, when suddenly a scrambling sound of footsteps was heard, and Maka dashed through the two adjoining apartments and appeared before them. Instantly the captain was on his feet, his gun, which had been lying beside him, in his hand. Up sprang the others, mute, with surprise and fear on their faces. Maka, who was in a state of great excitement, and seemed unable to speak, gasped out the one word, "Gone!"

"What do you mean?" cried the captain.

Maka ran back toward the pa.s.sage, and pointed inward. Instantly the captain conjectured what he meant. Mok, the second African, had been stationed to watch the lake approach, and he had deserted! Now the hot thought flashed upon the captain that the rascal had been a spy. The Rackbirds had known that there were shipwrecked people in these caves.